He was a regular contributor to the Japanese news magazine Facta and he lectured widely on the secret world of intelligence. He also provided expert analysis on intelligence for US and European television and radio programs.[12] His book Gideon's Spies: Mossad's Secret Warriors became a major documentary for Channel Four that he wrote and narrated: The Spy Machine. It followed three years of research during which he was given access to Mossad’s main personnel. The documentary was co-produced by Open Media and Israfilm.[13]

Thomas was a cousin of the poet Dylan Thomas who helped him publish his first book.[9] He divided his time between his homes in Ireland and England, with his wife, an interior designer.[9] His five children work in various parts of the entertainment industry.[9]